linux-kernel - Re: [PATCH v3] drm: add modifiers for Apple GPU layouts

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Message-Id: <5a4b80f3-c121-4d5e-ae88-442a8480d285@app.fastmail.com>
Date: Sun, 02 Mar 2025 17:02:51 +0100
From: "Sven Peter" <sven@...npeter.dev>
To: "Alyssa Rosenzweig" <alyssa@...enzweig.io>,
 "David Airlie" <airlied@...il.com>, "Simona Vetter" <simona@...ll.ch>,
 "Maarten Lankhorst" <maarten.lankhorst@...ux.intel.com>,
 "Maxime Ripard" <mripard@...nel.org>,
 "Thomas Zimmermann" <tzimmermann@...e.de>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 asahi@...ts.linux.dev, "Faith Ekstrand" <faith.ekstrand@...labora.com>
Subject: Re: [PATCH v3] drm: add modifiers for Apple GPU layouts

On Sat, Mar 1, 2025, at 23:01, Alyssa Rosenzweig wrote:
> Apple GPUs support various non-linear image layouts. Add modifiers for
> these layouts. Mesa requires these modifiers to share non-linear buffers
> across processes, but no other userspace or kernel support is
> required/expected.
>
> These layouts are notably not used for interchange across hardware
> blocks (e.g. with the display controller). There are other layouts for
> that but we don't support them either in userspace or kernelspace yet
> (even downstream), so we don't add modifiers here.
>
> Signed-off-by: Alyssa Rosenzweig <alyssa@...enzweig.io>
> ---

I don't understand much about GPUs but the explanation here is clear enough even for me.

Reviewed-by: Sven Peter <sven@...npeter.dev>


Best,


Sven